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1 | /* |
2 | * cfg80211 scan result handling |
3 | * |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> |
5 | */ |
6 | #include <linux/kernel.h> |
7 | #include <linux/slab.h> |
8 | #include <linux/module.h> |
9 | #include <linux/netdevice.h> |
10 | #include <linux/wireless.h> |
11 | #include <linux/nl80211.h> |
12 | #include <linux/etherdevice.h> |
13 | #include <net/arp.h> |
14 | #include <net/cfg80211.h> |
15 | #include <net/cfg80211-wext.h> |
16 | #include <net/iw_handler.h> |
17 | #include "core.h" |
18 | #include "nl80211.h" |
19 | #include "wext-compat.h" |
20 | #include "rdev-ops.h" |
21 | |
22 | /** |
23 | * DOC: BSS tree/list structure |
24 | * |
25 | * At the top level, the BSS list is kept in both a list in each |
26 | * registered device (@bss_list) as well as an RB-tree for faster |
27 | * lookup. In the RB-tree, entries can be looked up using their |
28 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID |
29 | * for other BSSes. |
30 | * |
31 | * Due to the possibility of hidden SSIDs, there's a second level |
32 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. |
33 | * The hidden_list connects all BSSes belonging to a single AP |
34 | * that has a hidden SSID, and connects beacon and probe response |
35 | * entries. For a probe response entry for a hidden SSID, the |
36 | * hidden_beacon_bss pointer points to the BSS struct holding the |
37 | * beacon's information. |
38 | * |
39 | * Reference counting is done for all these references except for |
40 | * the hidden_list, so that a beacon BSS struct that is otherwise |
41 | * not referenced has one reference for being on the bss_list and |
42 | * one for each probe response entry that points to it using the |
43 | * hidden_beacon_bss pointer. When a BSS struct that has such a |
44 | * pointer is get/put, the refcount update is also propagated to |
45 | * the referenced struct, this ensure that it cannot get removed |
46 | * while somebody is using the probe response version. |
47 | * |
48 | * Note that the hidden_beacon_bss pointer never changes, due to |
49 | * the reference counting. Therefore, no locking is needed for |
50 | * it. |
51 | * |
52 | * Also note that the hidden_beacon_bss pointer is only relevant |
53 | * if the driver uses something other than the IEs, e.g. private |
54 | * data stored stored in the BSS struct, since the beacon IEs are |
55 | * also linked into the probe response struct. |
56 | */ |
57 | |
58 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
59 | |
60 | static void bss_free(struct cfg80211_internal_bss *bss) |
61 | { |
62 | struct cfg80211_bss_ies *ies; |
63 | |
64 | if (WARN_ON(atomic_read(&bss->hold))) |
65 | return; |
66 | |
67 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
68 | if (ies && !bss->pub.hidden_beacon_bss) |
69 | kfree_rcu(ies, rcu_head); |
70 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); |
71 | if (ies) |
72 | kfree_rcu(ies, rcu_head); |
73 | |
74 | /* |
75 | * This happens when the module is removed, it doesn't |
76 | * really matter any more save for completeness |
77 | */ |
78 | if (!list_empty(&bss->hidden_list)) |
79 | list_del(&bss->hidden_list); |
80 | |
81 | kfree(bss); |
82 | } |
83 | |
84 | static inline void bss_ref_get(struct cfg80211_registered_device *dev, |
85 | struct cfg80211_internal_bss *bss) |
86 | { |
87 | lockdep_assert_held(&dev->bss_lock); |
88 | |
89 | bss->refcount++; |
90 | if (bss->pub.hidden_beacon_bss) { |
91 | bss = container_of(bss->pub.hidden_beacon_bss, |
92 | struct cfg80211_internal_bss, |
93 | pub); |
94 | bss->refcount++; |
95 | } |
96 | } |
97 | |
98 | static inline void bss_ref_put(struct cfg80211_registered_device *dev, |
99 | struct cfg80211_internal_bss *bss) |
100 | { |
101 | lockdep_assert_held(&dev->bss_lock); |
102 | |
103 | if (bss->pub.hidden_beacon_bss) { |
104 | struct cfg80211_internal_bss *hbss; |
105 | hbss = container_of(bss->pub.hidden_beacon_bss, |
106 | struct cfg80211_internal_bss, |
107 | pub); |
108 | hbss->refcount--; |
109 | if (hbss->refcount == 0) |
110 | bss_free(hbss); |
111 | } |
112 | bss->refcount--; |
113 | if (bss->refcount == 0) |
114 | bss_free(bss); |
115 | } |
116 | |
117 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, |
118 | struct cfg80211_internal_bss *bss) |
119 | { |
120 | lockdep_assert_held(&dev->bss_lock); |
121 | |
122 | if (!list_empty(&bss->hidden_list)) { |
123 | /* |
124 | * don't remove the beacon entry if it has |
125 | * probe responses associated with it |
126 | */ |
127 | if (!bss->pub.hidden_beacon_bss) |
128 | return false; |
129 | /* |
130 | * if it's a probe response entry break its |
131 | * link to the other entries in the group |
132 | */ |
133 | list_del_init(&bss->hidden_list); |
134 | } |
135 | |
136 | list_del_init(&bss->list); |
137 | rb_erase(&bss->rbn, &dev->bss_tree); |
138 | bss_ref_put(dev, bss); |
139 | return true; |
140 | } |
141 | |
142 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, |
143 | unsigned long expire_time) |
144 | { |
145 | struct cfg80211_internal_bss *bss, *tmp; |
146 | bool expired = false; |
147 | |
148 | lockdep_assert_held(&dev->bss_lock); |
149 | |
150 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
151 | if (atomic_read(&bss->hold)) |
152 | continue; |
153 | if (!time_after(expire_time, bss->ts)) |
154 | continue; |
155 | |
156 | if (__cfg80211_unlink_bss(dev, bss)) |
157 | expired = true; |
158 | } |
159 | |
160 | if (expired) |
161 | dev->bss_generation++; |
162 | } |
163 | |
164 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
165 | { |
166 | struct cfg80211_scan_request *request; |
167 | struct wireless_dev *wdev; |
168 | #ifdef CONFIG_CFG80211_WEXT |
169 | union iwreq_data wrqu; |
170 | #endif |
171 | |
172 | ASSERT_RTNL(); |
173 | |
174 | request = rdev->scan_req; |
175 | |
176 | if (!request) |
177 | return; |
178 | |
179 | wdev = request->wdev; |
180 | |
181 | /* |
182 | * This must be before sending the other events! |
183 | * Otherwise, wpa_supplicant gets completely confused with |
184 | * wext events. |
185 | */ |
186 | if (wdev->netdev) |
187 | cfg80211_sme_scan_done(wdev->netdev); |
188 | |
189 | if (request->aborted) { |
190 | nl80211_send_scan_aborted(rdev, wdev); |
191 | } else { |
192 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { |
193 | /* flush entries from previous scans */ |
194 | spin_lock_bh(&rdev->bss_lock); |
195 | __cfg80211_bss_expire(rdev, request->scan_start); |
196 | spin_unlock_bh(&rdev->bss_lock); |
197 | } |
198 | nl80211_send_scan_done(rdev, wdev); |
199 | } |
200 | |
201 | #ifdef CONFIG_CFG80211_WEXT |
202 | if (wdev->netdev && !request->aborted) { |
203 | memset(&wrqu, 0, sizeof(wrqu)); |
204 | |
205 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
206 | } |
207 | #endif |
208 | |
209 | if (wdev->netdev) |
210 | dev_put(wdev->netdev); |
211 | |
212 | rdev->scan_req = NULL; |
213 | |
214 | /* |
215 | * OK. If this is invoked with "leak" then we can't |
216 | * free this ... but we've cleaned it up anyway. The |
217 | * driver failed to call the scan_done callback, so |
218 | * all bets are off, it might still be trying to use |
219 | * the scan request or not ... if it accesses the dev |
220 | * in there (it shouldn't anyway) then it may crash. |
221 | */ |
222 | if (!leak) |
223 | kfree(request); |
224 | } |
225 | |
226 | void __cfg80211_scan_done(struct work_struct *wk) |
227 | { |
228 | struct cfg80211_registered_device *rdev; |
229 | |
230 | rdev = container_of(wk, struct cfg80211_registered_device, |
231 | scan_done_wk); |
232 | |
233 | rtnl_lock(); |
234 | ___cfg80211_scan_done(rdev, false); |
235 | rtnl_unlock(); |
236 | } |
237 | |
238 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
239 | { |
240 | trace_cfg80211_scan_done(request, aborted); |
241 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
242 | |
243 | request->aborted = aborted; |
244 | request->notified = true; |
245 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
246 | } |
247 | EXPORT_SYMBOL(cfg80211_scan_done); |
248 | |
249 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
250 | { |
251 | struct cfg80211_registered_device *rdev; |
252 | struct cfg80211_sched_scan_request *request; |
253 | |
254 | rdev = container_of(wk, struct cfg80211_registered_device, |
255 | sched_scan_results_wk); |
256 | |
257 | rtnl_lock(); |
258 | |
259 | request = rdev->sched_scan_req; |
260 | |
261 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
262 | if (request) { |
263 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { |
264 | /* flush entries from previous scans */ |
265 | spin_lock_bh(&rdev->bss_lock); |
266 | __cfg80211_bss_expire(rdev, request->scan_start); |
267 | spin_unlock_bh(&rdev->bss_lock); |
268 | request->scan_start = |
269 | jiffies + msecs_to_jiffies(request->interval); |
270 | } |
271 | nl80211_send_sched_scan_results(rdev, request->dev); |
272 | } |
273 | |
274 | rtnl_unlock(); |
275 | } |
276 | |
277 | void cfg80211_sched_scan_results(struct wiphy *wiphy) |
278 | { |
279 | trace_cfg80211_sched_scan_results(wiphy); |
280 | /* ignore if we're not scanning */ |
281 | if (wiphy_to_dev(wiphy)->sched_scan_req) |
282 | queue_work(cfg80211_wq, |
283 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); |
284 | } |
285 | EXPORT_SYMBOL(cfg80211_sched_scan_results); |
286 | |
287 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
288 | { |
289 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
290 | |
291 | trace_cfg80211_sched_scan_stopped(wiphy); |
292 | |
293 | rtnl_lock(); |
294 | __cfg80211_stop_sched_scan(rdev, true); |
295 | rtnl_unlock(); |
296 | } |
297 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
298 | |
299 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
300 | bool driver_initiated) |
301 | { |
302 | struct net_device *dev; |
303 | |
304 | ASSERT_RTNL(); |
305 | |
306 | if (!rdev->sched_scan_req) |
307 | return -ENOENT; |
308 | |
309 | dev = rdev->sched_scan_req->dev; |
310 | |
311 | if (!driver_initiated) { |
312 | int err = rdev_sched_scan_stop(rdev, dev); |
313 | if (err) |
314 | return err; |
315 | } |
316 | |
317 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); |
318 | |
319 | kfree(rdev->sched_scan_req); |
320 | rdev->sched_scan_req = NULL; |
321 | |
322 | return 0; |
323 | } |
324 | |
325 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
326 | unsigned long age_secs) |
327 | { |
328 | struct cfg80211_internal_bss *bss; |
329 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); |
330 | |
331 | spin_lock_bh(&dev->bss_lock); |
332 | list_for_each_entry(bss, &dev->bss_list, list) |
333 | bss->ts -= age_jiffies; |
334 | spin_unlock_bh(&dev->bss_lock); |
335 | } |
336 | |
337 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
338 | { |
339 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
340 | } |
341 | |
342 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
343 | { |
344 | while (len > 2 && ies[0] != eid) { |
345 | len -= ies[1] + 2; |
346 | ies += ies[1] + 2; |
347 | } |
348 | if (len < 2) |
349 | return NULL; |
350 | if (len < 2 + ies[1]) |
351 | return NULL; |
352 | return ies; |
353 | } |
354 | EXPORT_SYMBOL(cfg80211_find_ie); |
355 | |
356 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
357 | const u8 *ies, int len) |
358 | { |
359 | struct ieee80211_vendor_ie *ie; |
360 | const u8 *pos = ies, *end = ies + len; |
361 | int ie_oui; |
362 | |
363 | while (pos < end) { |
364 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, |
365 | end - pos); |
366 | if (!pos) |
367 | return NULL; |
368 | |
369 | ie = (struct ieee80211_vendor_ie *)pos; |
370 | |
371 | /* make sure we can access ie->len */ |
372 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); |
373 | |
374 | if (ie->len < sizeof(*ie)) |
375 | goto cont; |
376 | |
377 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
378 | if (ie_oui == oui && ie->oui_type == oui_type) |
379 | return pos; |
380 | cont: |
381 | pos += 2 + ie->len; |
382 | } |
383 | return NULL; |
384 | } |
385 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); |
386 | |
387 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
388 | const u8 *ssid, size_t ssid_len) |
389 | { |
390 | const struct cfg80211_bss_ies *ies; |
391 | const u8 *ssidie; |
392 | |
393 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
394 | return false; |
395 | |
396 | if (!ssid) |
397 | return true; |
398 | |
399 | ies = rcu_access_pointer(a->ies); |
400 | if (!ies) |
401 | return false; |
402 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
403 | if (!ssidie) |
404 | return false; |
405 | if (ssidie[1] != ssid_len) |
406 | return false; |
407 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; |
408 | } |
409 | |
410 | /** |
411 | * enum bss_compare_mode - BSS compare mode |
412 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) |
413 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode |
414 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode |
415 | */ |
416 | enum bss_compare_mode { |
417 | BSS_CMP_REGULAR, |
418 | BSS_CMP_HIDE_ZLEN, |
419 | BSS_CMP_HIDE_NUL, |
420 | }; |
421 | |
422 | static int cmp_bss(struct cfg80211_bss *a, |
423 | struct cfg80211_bss *b, |
424 | enum bss_compare_mode mode) |
425 | { |
426 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
427 | const u8 *ie1 = NULL; |
428 | const u8 *ie2 = NULL; |
429 | int i, r; |
430 | |
431 | if (a->channel != b->channel) |
432 | return b->channel->center_freq - a->channel->center_freq; |
433 | |
434 | a_ies = rcu_access_pointer(a->ies); |
435 | if (!a_ies) |
436 | return -1; |
437 | b_ies = rcu_access_pointer(b->ies); |
438 | if (!b_ies) |
439 | return 1; |
440 | |
441 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
442 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
443 | a_ies->data, a_ies->len); |
444 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) |
445 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, |
446 | b_ies->data, b_ies->len); |
447 | if (ie1 && ie2) { |
448 | int mesh_id_cmp; |
449 | |
450 | if (ie1[1] == ie2[1]) |
451 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
452 | else |
453 | mesh_id_cmp = ie2[1] - ie1[1]; |
454 | |
455 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
456 | a_ies->data, a_ies->len); |
457 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
458 | b_ies->data, b_ies->len); |
459 | if (ie1 && ie2) { |
460 | if (mesh_id_cmp) |
461 | return mesh_id_cmp; |
462 | if (ie1[1] != ie2[1]) |
463 | return ie2[1] - ie1[1]; |
464 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
465 | } |
466 | } |
467 | |
468 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
469 | if (r) |
470 | return r; |
471 | |
472 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
473 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); |
474 | |
475 | if (!ie1 && !ie2) |
476 | return 0; |
477 | |
478 | /* |
479 | * Note that with "hide_ssid", the function returns a match if |
480 | * the already-present BSS ("b") is a hidden SSID beacon for |
481 | * the new BSS ("a"). |
482 | */ |
483 | |
484 | /* sort missing IE before (left of) present IE */ |
485 | if (!ie1) |
486 | return -1; |
487 | if (!ie2) |
488 | return 1; |
489 | |
490 | switch (mode) { |
491 | case BSS_CMP_HIDE_ZLEN: |
492 | /* |
493 | * In ZLEN mode we assume the BSS entry we're |
494 | * looking for has a zero-length SSID. So if |
495 | * the one we're looking at right now has that, |
496 | * return 0. Otherwise, return the difference |
497 | * in length, but since we're looking for the |
498 | * 0-length it's really equivalent to returning |
499 | * the length of the one we're looking at. |
500 | * |
501 | * No content comparison is needed as we assume |
502 | * the content length is zero. |
503 | */ |
504 | return ie2[1]; |
505 | case BSS_CMP_REGULAR: |
506 | default: |
507 | /* sort by length first, then by contents */ |
508 | if (ie1[1] != ie2[1]) |
509 | return ie2[1] - ie1[1]; |
510 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
511 | case BSS_CMP_HIDE_NUL: |
512 | if (ie1[1] != ie2[1]) |
513 | return ie2[1] - ie1[1]; |
514 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ |
515 | for (i = 0; i < ie2[1]; i++) |
516 | if (ie2[i + 2]) |
517 | return -1; |
518 | return 0; |
519 | } |
520 | } |
521 | |
522 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
523 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
524 | struct ieee80211_channel *channel, |
525 | const u8 *bssid, |
526 | const u8 *ssid, size_t ssid_len, |
527 | u16 capa_mask, u16 capa_val) |
528 | { |
529 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
530 | struct cfg80211_internal_bss *bss, *res = NULL; |
531 | unsigned long now = jiffies; |
532 | |
533 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
534 | capa_val); |
535 | |
536 | spin_lock_bh(&dev->bss_lock); |
537 | |
538 | list_for_each_entry(bss, &dev->bss_list, list) { |
539 | if ((bss->pub.capability & capa_mask) != capa_val) |
540 | continue; |
541 | if (channel && bss->pub.channel != channel) |
542 | continue; |
543 | /* Don't get expired BSS structs */ |
544 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && |
545 | !atomic_read(&bss->hold)) |
546 | continue; |
547 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
548 | res = bss; |
549 | bss_ref_get(dev, res); |
550 | break; |
551 | } |
552 | } |
553 | |
554 | spin_unlock_bh(&dev->bss_lock); |
555 | if (!res) |
556 | return NULL; |
557 | trace_cfg80211_return_bss(&res->pub); |
558 | return &res->pub; |
559 | } |
560 | EXPORT_SYMBOL(cfg80211_get_bss); |
561 | |
562 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
563 | struct cfg80211_internal_bss *bss) |
564 | { |
565 | struct rb_node **p = &dev->bss_tree.rb_node; |
566 | struct rb_node *parent = NULL; |
567 | struct cfg80211_internal_bss *tbss; |
568 | int cmp; |
569 | |
570 | while (*p) { |
571 | parent = *p; |
572 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); |
573 | |
574 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
575 | |
576 | if (WARN_ON(!cmp)) { |
577 | /* will sort of leak this BSS */ |
578 | return; |
579 | } |
580 | |
581 | if (cmp < 0) |
582 | p = &(*p)->rb_left; |
583 | else |
584 | p = &(*p)->rb_right; |
585 | } |
586 | |
587 | rb_link_node(&bss->rbn, parent, p); |
588 | rb_insert_color(&bss->rbn, &dev->bss_tree); |
589 | } |
590 | |
591 | static struct cfg80211_internal_bss * |
592 | rb_find_bss(struct cfg80211_registered_device *dev, |
593 | struct cfg80211_internal_bss *res, |
594 | enum bss_compare_mode mode) |
595 | { |
596 | struct rb_node *n = dev->bss_tree.rb_node; |
597 | struct cfg80211_internal_bss *bss; |
598 | int r; |
599 | |
600 | while (n) { |
601 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); |
602 | r = cmp_bss(&res->pub, &bss->pub, mode); |
603 | |
604 | if (r == 0) |
605 | return bss; |
606 | else if (r < 0) |
607 | n = n->rb_left; |
608 | else |
609 | n = n->rb_right; |
610 | } |
611 | |
612 | return NULL; |
613 | } |
614 | |
615 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev, |
616 | struct cfg80211_internal_bss *new) |
617 | { |
618 | const struct cfg80211_bss_ies *ies; |
619 | struct cfg80211_internal_bss *bss; |
620 | const u8 *ie; |
621 | int i, ssidlen; |
622 | u8 fold = 0; |
623 | |
624 | ies = rcu_access_pointer(new->pub.beacon_ies); |
625 | if (WARN_ON(!ies)) |
626 | return false; |
627 | |
628 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
629 | if (!ie) { |
630 | /* nothing to do */ |
631 | return true; |
632 | } |
633 | |
634 | ssidlen = ie[1]; |
635 | for (i = 0; i < ssidlen; i++) |
636 | fold |= ie[2 + i]; |
637 | |
638 | if (fold) { |
639 | /* not a hidden SSID */ |
640 | return true; |
641 | } |
642 | |
643 | /* This is the bad part ... */ |
644 | |
645 | list_for_each_entry(bss, &dev->bss_list, list) { |
646 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
647 | continue; |
648 | if (bss->pub.channel != new->pub.channel) |
649 | continue; |
650 | if (bss->pub.scan_width != new->pub.scan_width) |
651 | continue; |
652 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
653 | continue; |
654 | ies = rcu_access_pointer(bss->pub.ies); |
655 | if (!ies) |
656 | continue; |
657 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
658 | if (!ie) |
659 | continue; |
660 | if (ssidlen && ie[1] != ssidlen) |
661 | continue; |
662 | /* that would be odd ... */ |
663 | if (bss->pub.beacon_ies) |
664 | continue; |
665 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
666 | continue; |
667 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) |
668 | list_del(&bss->hidden_list); |
669 | /* combine them */ |
670 | list_add(&bss->hidden_list, &new->hidden_list); |
671 | bss->pub.hidden_beacon_bss = &new->pub; |
672 | new->refcount += bss->refcount; |
673 | rcu_assign_pointer(bss->pub.beacon_ies, |
674 | new->pub.beacon_ies); |
675 | } |
676 | |
677 | return true; |
678 | } |
679 | |
680 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
681 | static struct cfg80211_internal_bss * |
682 | cfg80211_bss_update(struct cfg80211_registered_device *dev, |
683 | struct cfg80211_internal_bss *tmp) |
684 | { |
685 | struct cfg80211_internal_bss *found = NULL; |
686 | |
687 | if (WARN_ON(!tmp->pub.channel)) |
688 | return NULL; |
689 | |
690 | tmp->ts = jiffies; |
691 | |
692 | spin_lock_bh(&dev->bss_lock); |
693 | |
694 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
695 | spin_unlock_bh(&dev->bss_lock); |
696 | return NULL; |
697 | } |
698 | |
699 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); |
700 | |
701 | if (found) { |
702 | /* Update IEs */ |
703 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
704 | const struct cfg80211_bss_ies *old; |
705 | |
706 | old = rcu_access_pointer(found->pub.proberesp_ies); |
707 | |
708 | rcu_assign_pointer(found->pub.proberesp_ies, |
709 | tmp->pub.proberesp_ies); |
710 | /* Override possible earlier Beacon frame IEs */ |
711 | rcu_assign_pointer(found->pub.ies, |
712 | tmp->pub.proberesp_ies); |
713 | if (old) |
714 | kfree_rcu((struct cfg80211_bss_ies *)old, |
715 | rcu_head); |
716 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { |
717 | const struct cfg80211_bss_ies *old; |
718 | struct cfg80211_internal_bss *bss; |
719 | |
720 | if (found->pub.hidden_beacon_bss && |
721 | !list_empty(&found->hidden_list)) { |
722 | const struct cfg80211_bss_ies *f; |
723 | |
724 | /* |
725 | * The found BSS struct is one of the probe |
726 | * response members of a group, but we're |
727 | * receiving a beacon (beacon_ies in the tmp |
728 | * bss is used). This can only mean that the |
729 | * AP changed its beacon from not having an |
730 | * SSID to showing it, which is confusing so |
731 | * drop this information. |
732 | */ |
733 | |
734 | f = rcu_access_pointer(tmp->pub.beacon_ies); |
735 | kfree_rcu((struct cfg80211_bss_ies *)f, |
736 | rcu_head); |
737 | goto drop; |
738 | } |
739 | |
740 | old = rcu_access_pointer(found->pub.beacon_ies); |
741 | |
742 | rcu_assign_pointer(found->pub.beacon_ies, |
743 | tmp->pub.beacon_ies); |
744 | |
745 | /* Override IEs if they were from a beacon before */ |
746 | if (old == rcu_access_pointer(found->pub.ies)) |
747 | rcu_assign_pointer(found->pub.ies, |
748 | tmp->pub.beacon_ies); |
749 | |
750 | /* Assign beacon IEs to all sub entries */ |
751 | list_for_each_entry(bss, &found->hidden_list, |
752 | hidden_list) { |
753 | const struct cfg80211_bss_ies *ies; |
754 | |
755 | ies = rcu_access_pointer(bss->pub.beacon_ies); |
756 | WARN_ON(ies != old); |
757 | |
758 | rcu_assign_pointer(bss->pub.beacon_ies, |
759 | tmp->pub.beacon_ies); |
760 | } |
761 | |
762 | if (old) |
763 | kfree_rcu((struct cfg80211_bss_ies *)old, |
764 | rcu_head); |
765 | } |
766 | |
767 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
768 | found->pub.signal = tmp->pub.signal; |
769 | found->pub.capability = tmp->pub.capability; |
770 | found->ts = tmp->ts; |
771 | } else { |
772 | struct cfg80211_internal_bss *new; |
773 | struct cfg80211_internal_bss *hidden; |
774 | struct cfg80211_bss_ies *ies; |
775 | |
776 | /* |
777 | * create a copy -- the "res" variable that is passed in |
778 | * is allocated on the stack since it's not needed in the |
779 | * more common case of an update |
780 | */ |
781 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, |
782 | GFP_ATOMIC); |
783 | if (!new) { |
784 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); |
785 | if (ies) |
786 | kfree_rcu(ies, rcu_head); |
787 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); |
788 | if (ies) |
789 | kfree_rcu(ies, rcu_head); |
790 | goto drop; |
791 | } |
792 | memcpy(new, tmp, sizeof(*new)); |
793 | new->refcount = 1; |
794 | INIT_LIST_HEAD(&new->hidden_list); |
795 | |
796 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
797 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); |
798 | if (!hidden) |
799 | hidden = rb_find_bss(dev, tmp, |
800 | BSS_CMP_HIDE_NUL); |
801 | if (hidden) { |
802 | new->pub.hidden_beacon_bss = &hidden->pub; |
803 | list_add(&new->hidden_list, |
804 | &hidden->hidden_list); |
805 | hidden->refcount++; |
806 | rcu_assign_pointer(new->pub.beacon_ies, |
807 | hidden->pub.beacon_ies); |
808 | } |
809 | } else { |
810 | /* |
811 | * Ok so we found a beacon, and don't have an entry. If |
812 | * it's a beacon with hidden SSID, we might be in for an |
813 | * expensive search for any probe responses that should |
814 | * be grouped with this beacon for updates ... |
815 | */ |
816 | if (!cfg80211_combine_bsses(dev, new)) { |
817 | kfree(new); |
818 | goto drop; |
819 | } |
820 | } |
821 | |
822 | list_add_tail(&new->list, &dev->bss_list); |
823 | rb_insert_bss(dev, new); |
824 | found = new; |
825 | } |
826 | |
827 | dev->bss_generation++; |
828 | bss_ref_get(dev, found); |
829 | spin_unlock_bh(&dev->bss_lock); |
830 | |
831 | return found; |
832 | drop: |
833 | spin_unlock_bh(&dev->bss_lock); |
834 | return NULL; |
835 | } |
836 | |
837 | static struct ieee80211_channel * |
838 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, |
839 | struct ieee80211_channel *channel) |
840 | { |
841 | const u8 *tmp; |
842 | u32 freq; |
843 | int channel_number = -1; |
844 | |
845 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); |
846 | if (tmp && tmp[1] == 1) { |
847 | channel_number = tmp[2]; |
848 | } else { |
849 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); |
850 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { |
851 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); |
852 | |
853 | channel_number = htop->primary_chan; |
854 | } |
855 | } |
856 | |
857 | if (channel_number < 0) |
858 | return channel; |
859 | |
860 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); |
861 | channel = ieee80211_get_channel(wiphy, freq); |
862 | if (!channel) |
863 | return NULL; |
864 | if (channel->flags & IEEE80211_CHAN_DISABLED) |
865 | return NULL; |
866 | return channel; |
867 | } |
868 | |
869 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
870 | struct cfg80211_bss* |
871 | cfg80211_inform_bss_width(struct wiphy *wiphy, |
872 | struct ieee80211_channel *channel, |
873 | enum nl80211_bss_scan_width scan_width, |
874 | const u8 *bssid, u64 tsf, u16 capability, |
875 | u16 beacon_interval, const u8 *ie, size_t ielen, |
876 | s32 signal, gfp_t gfp) |
877 | { |
878 | struct cfg80211_bss_ies *ies; |
879 | struct cfg80211_internal_bss tmp = {}, *res; |
880 | |
881 | if (WARN_ON(!wiphy)) |
882 | return NULL; |
883 | |
884 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
885 | (signal < 0 || signal > 100))) |
886 | return NULL; |
887 | |
888 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
889 | if (!channel) |
890 | return NULL; |
891 | |
892 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
893 | tmp.pub.channel = channel; |
894 | tmp.pub.scan_width = scan_width; |
895 | tmp.pub.signal = signal; |
896 | tmp.pub.beacon_interval = beacon_interval; |
897 | tmp.pub.capability = capability; |
898 | /* |
899 | * Since we do not know here whether the IEs are from a Beacon or Probe |
900 | * Response frame, we need to pick one of the options and only use it |
901 | * with the driver that does not provide the full Beacon/Probe Response |
902 | * frame. Use Beacon frame pointer to avoid indicating that this should |
903 | * override the IEs pointer should we have received an earlier |
904 | * indication of Probe Response data. |
905 | */ |
906 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
907 | if (!ies) |
908 | return NULL; |
909 | ies->len = ielen; |
910 | ies->tsf = tsf; |
911 | memcpy(ies->data, ie, ielen); |
912 | |
913 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
914 | rcu_assign_pointer(tmp.pub.ies, ies); |
915 | |
916 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
917 | if (!res) |
918 | return NULL; |
919 | |
920 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
921 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
922 | |
923 | trace_cfg80211_return_bss(&res->pub); |
924 | /* cfg80211_bss_update gives us a referenced result */ |
925 | return &res->pub; |
926 | } |
927 | EXPORT_SYMBOL(cfg80211_inform_bss_width); |
928 | |
929 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
930 | struct cfg80211_bss * |
931 | cfg80211_inform_bss_width_frame(struct wiphy *wiphy, |
932 | struct ieee80211_channel *channel, |
933 | enum nl80211_bss_scan_width scan_width, |
934 | struct ieee80211_mgmt *mgmt, size_t len, |
935 | s32 signal, gfp_t gfp) |
936 | { |
937 | struct cfg80211_internal_bss tmp = {}, *res; |
938 | struct cfg80211_bss_ies *ies; |
939 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
940 | u.probe_resp.variable); |
941 | |
942 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
943 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); |
944 | |
945 | trace_cfg80211_inform_bss_width_frame(wiphy, channel, scan_width, mgmt, |
946 | len, signal); |
947 | |
948 | if (WARN_ON(!mgmt)) |
949 | return NULL; |
950 | |
951 | if (WARN_ON(!wiphy)) |
952 | return NULL; |
953 | |
954 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
955 | (signal < 0 || signal > 100))) |
956 | return NULL; |
957 | |
958 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
959 | return NULL; |
960 | |
961 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
962 | ielen, channel); |
963 | if (!channel) |
964 | return NULL; |
965 | |
966 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
967 | if (!ies) |
968 | return NULL; |
969 | ies->len = ielen; |
970 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
971 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
972 | |
973 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
974 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); |
975 | else |
976 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
977 | rcu_assign_pointer(tmp.pub.ies, ies); |
978 | |
979 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
980 | tmp.pub.channel = channel; |
981 | tmp.pub.scan_width = scan_width; |
982 | tmp.pub.signal = signal; |
983 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
984 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); |
985 | |
986 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
987 | if (!res) |
988 | return NULL; |
989 | |
990 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
991 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
992 | |
993 | trace_cfg80211_return_bss(&res->pub); |
994 | /* cfg80211_bss_update gives us a referenced result */ |
995 | return &res->pub; |
996 | } |
997 | EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); |
998 | |
999 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1000 | { |
1001 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
1002 | struct cfg80211_internal_bss *bss; |
1003 | |
1004 | if (!pub) |
1005 | return; |
1006 | |
1007 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
1008 | |
1009 | spin_lock_bh(&dev->bss_lock); |
1010 | bss_ref_get(dev, bss); |
1011 | spin_unlock_bh(&dev->bss_lock); |
1012 | } |
1013 | EXPORT_SYMBOL(cfg80211_ref_bss); |
1014 | |
1015 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1016 | { |
1017 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
1018 | struct cfg80211_internal_bss *bss; |
1019 | |
1020 | if (!pub) |
1021 | return; |
1022 | |
1023 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
1024 | |
1025 | spin_lock_bh(&dev->bss_lock); |
1026 | bss_ref_put(dev, bss); |
1027 | spin_unlock_bh(&dev->bss_lock); |
1028 | } |
1029 | EXPORT_SYMBOL(cfg80211_put_bss); |
1030 | |
1031 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1032 | { |
1033 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
1034 | struct cfg80211_internal_bss *bss; |
1035 | |
1036 | if (WARN_ON(!pub)) |
1037 | return; |
1038 | |
1039 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
1040 | |
1041 | spin_lock_bh(&dev->bss_lock); |
1042 | if (!list_empty(&bss->list)) { |
1043 | if (__cfg80211_unlink_bss(dev, bss)) |
1044 | dev->bss_generation++; |
1045 | } |
1046 | spin_unlock_bh(&dev->bss_lock); |
1047 | } |
1048 | EXPORT_SYMBOL(cfg80211_unlink_bss); |
1049 | |
1050 | #ifdef CONFIG_CFG80211_WEXT |
1051 | static struct cfg80211_registered_device * |
1052 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) |
1053 | { |
1054 | struct cfg80211_registered_device *rdev; |
1055 | struct net_device *dev; |
1056 | |
1057 | ASSERT_RTNL(); |
1058 | |
1059 | dev = dev_get_by_index(net, ifindex); |
1060 | if (!dev) |
1061 | return ERR_PTR(-ENODEV); |
1062 | if (dev->ieee80211_ptr) |
1063 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
1064 | else |
1065 | rdev = ERR_PTR(-ENODEV); |
1066 | dev_put(dev); |
1067 | return rdev; |
1068 | } |
1069 | |
1070 | int cfg80211_wext_siwscan(struct net_device *dev, |
1071 | struct iw_request_info *info, |
1072 | union iwreq_data *wrqu, char *extra) |
1073 | { |
1074 | struct cfg80211_registered_device *rdev; |
1075 | struct wiphy *wiphy; |
1076 | struct iw_scan_req *wreq = NULL; |
1077 | struct cfg80211_scan_request *creq = NULL; |
1078 | int i, err, n_channels = 0; |
1079 | enum ieee80211_band band; |
1080 | |
1081 | if (!netif_running(dev)) |
1082 | return -ENETDOWN; |
1083 | |
1084 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1085 | wreq = (struct iw_scan_req *)extra; |
1086 | |
1087 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
1088 | |
1089 | if (IS_ERR(rdev)) |
1090 | return PTR_ERR(rdev); |
1091 | |
1092 | if (rdev->scan_req) { |
1093 | err = -EBUSY; |
1094 | goto out; |
1095 | } |
1096 | |
1097 | wiphy = &rdev->wiphy; |
1098 | |
1099 | /* Determine number of channels, needed to allocate creq */ |
1100 | if (wreq && wreq->num_channels) |
1101 | n_channels = wreq->num_channels; |
1102 | else { |
1103 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) |
1104 | if (wiphy->bands[band]) |
1105 | n_channels += wiphy->bands[band]->n_channels; |
1106 | } |
1107 | |
1108 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + |
1109 | n_channels * sizeof(void *), |
1110 | GFP_ATOMIC); |
1111 | if (!creq) { |
1112 | err = -ENOMEM; |
1113 | goto out; |
1114 | } |
1115 | |
1116 | creq->wiphy = wiphy; |
1117 | creq->wdev = dev->ieee80211_ptr; |
1118 | /* SSIDs come after channels */ |
1119 | creq->ssids = (void *)&creq->channels[n_channels]; |
1120 | creq->n_channels = n_channels; |
1121 | creq->n_ssids = 1; |
1122 | creq->scan_start = jiffies; |
1123 | |
1124 | /* translate "Scan on frequencies" request */ |
1125 | i = 0; |
1126 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
1127 | int j; |
1128 | |
1129 | if (!wiphy->bands[band]) |
1130 | continue; |
1131 | |
1132 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
1133 | /* ignore disabled channels */ |
1134 | if (wiphy->bands[band]->channels[j].flags & |
1135 | IEEE80211_CHAN_DISABLED) |
1136 | continue; |
1137 | |
1138 | /* If we have a wireless request structure and the |
1139 | * wireless request specifies frequencies, then search |
1140 | * for the matching hardware channel. |
1141 | */ |
1142 | if (wreq && wreq->num_channels) { |
1143 | int k; |
1144 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; |
1145 | for (k = 0; k < wreq->num_channels; k++) { |
1146 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
1147 | if (wext_freq == wiphy_freq) |
1148 | goto wext_freq_found; |
1149 | } |
1150 | goto wext_freq_not_found; |
1151 | } |
1152 | |
1153 | wext_freq_found: |
1154 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1155 | i++; |
1156 | wext_freq_not_found: ; |
1157 | } |
1158 | } |
1159 | /* No channels found? */ |
1160 | if (!i) { |
1161 | err = -EINVAL; |
1162 | goto out; |
1163 | } |
1164 | |
1165 | /* Set real number of channels specified in creq->channels[] */ |
1166 | creq->n_channels = i; |
1167 | |
1168 | /* translate "Scan for SSID" request */ |
1169 | if (wreq) { |
1170 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
1171 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1172 | err = -EINVAL; |
1173 | goto out; |
1174 | } |
1175 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1176 | creq->ssids[0].ssid_len = wreq->essid_len; |
1177 | } |
1178 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) |
1179 | creq->n_ssids = 0; |
1180 | } |
1181 | |
1182 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
1183 | if (wiphy->bands[i]) |
1184 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; |
1185 | |
1186 | rdev->scan_req = creq; |
1187 | err = rdev_scan(rdev, creq); |
1188 | if (err) { |
1189 | rdev->scan_req = NULL; |
1190 | /* creq will be freed below */ |
1191 | } else { |
1192 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
1193 | /* creq now owned by driver */ |
1194 | creq = NULL; |
1195 | dev_hold(dev); |
1196 | } |
1197 | out: |
1198 | kfree(creq); |
1199 | return err; |
1200 | } |
1201 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
1202 | |
1203 | static void ieee80211_scan_add_ies(struct iw_request_info *info, |
1204 | const struct cfg80211_bss_ies *ies, |
1205 | char **current_ev, char *end_buf) |
1206 | { |
1207 | const u8 *pos, *end, *next; |
1208 | struct iw_event iwe; |
1209 | |
1210 | if (!ies) |
1211 | return; |
1212 | |
1213 | /* |
1214 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
1215 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
1216 | */ |
1217 | pos = ies->data; |
1218 | end = pos + ies->len; |
1219 | |
1220 | while (end - pos > IW_GENERIC_IE_MAX) { |
1221 | next = pos + 2 + pos[1]; |
1222 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
1223 | next = next + 2 + next[1]; |
1224 | |
1225 | memset(&iwe, 0, sizeof(iwe)); |
1226 | iwe.cmd = IWEVGENIE; |
1227 | iwe.u.data.length = next - pos; |
1228 | *current_ev = iwe_stream_add_point(info, *current_ev, |
1229 | end_buf, &iwe, |
1230 | (void *)pos); |
1231 | |
1232 | pos = next; |
1233 | } |
1234 | |
1235 | if (end > pos) { |
1236 | memset(&iwe, 0, sizeof(iwe)); |
1237 | iwe.cmd = IWEVGENIE; |
1238 | iwe.u.data.length = end - pos; |
1239 | *current_ev = iwe_stream_add_point(info, *current_ev, |
1240 | end_buf, &iwe, |
1241 | (void *)pos); |
1242 | } |
1243 | } |
1244 | |
1245 | static char * |
1246 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1247 | struct cfg80211_internal_bss *bss, char *current_ev, |
1248 | char *end_buf) |
1249 | { |
1250 | const struct cfg80211_bss_ies *ies; |
1251 | struct iw_event iwe; |
1252 | const u8 *ie; |
1253 | u8 *buf, *cfg, *p; |
1254 | int rem, i, sig; |
1255 | bool ismesh = false; |
1256 | |
1257 | memset(&iwe, 0, sizeof(iwe)); |
1258 | iwe.cmd = SIOCGIWAP; |
1259 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
1260 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); |
1261 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
1262 | IW_EV_ADDR_LEN); |
1263 | |
1264 | memset(&iwe, 0, sizeof(iwe)); |
1265 | iwe.cmd = SIOCGIWFREQ; |
1266 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); |
1267 | iwe.u.freq.e = 0; |
1268 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
1269 | IW_EV_FREQ_LEN); |
1270 | |
1271 | memset(&iwe, 0, sizeof(iwe)); |
1272 | iwe.cmd = SIOCGIWFREQ; |
1273 | iwe.u.freq.m = bss->pub.channel->center_freq; |
1274 | iwe.u.freq.e = 6; |
1275 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
1276 | IW_EV_FREQ_LEN); |
1277 | |
1278 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
1279 | memset(&iwe, 0, sizeof(iwe)); |
1280 | iwe.cmd = IWEVQUAL; |
1281 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | |
1282 | IW_QUAL_NOISE_INVALID | |
1283 | IW_QUAL_QUAL_UPDATED; |
1284 | switch (wiphy->signal_type) { |
1285 | case CFG80211_SIGNAL_TYPE_MBM: |
1286 | sig = bss->pub.signal / 100; |
1287 | iwe.u.qual.level = sig; |
1288 | iwe.u.qual.updated |= IW_QUAL_DBM; |
1289 | if (sig < -110) /* rather bad */ |
1290 | sig = -110; |
1291 | else if (sig > -40) /* perfect */ |
1292 | sig = -40; |
1293 | /* will give a range of 0 .. 70 */ |
1294 | iwe.u.qual.qual = sig + 110; |
1295 | break; |
1296 | case CFG80211_SIGNAL_TYPE_UNSPEC: |
1297 | iwe.u.qual.level = bss->pub.signal; |
1298 | /* will give range 0 .. 100 */ |
1299 | iwe.u.qual.qual = bss->pub.signal; |
1300 | break; |
1301 | default: |
1302 | /* not reached */ |
1303 | break; |
1304 | } |
1305 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
1306 | &iwe, IW_EV_QUAL_LEN); |
1307 | } |
1308 | |
1309 | memset(&iwe, 0, sizeof(iwe)); |
1310 | iwe.cmd = SIOCGIWENCODE; |
1311 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) |
1312 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
1313 | else |
1314 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
1315 | iwe.u.data.length = 0; |
1316 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
1317 | &iwe, ""); |
1318 | |
1319 | rcu_read_lock(); |
1320 | ies = rcu_dereference(bss->pub.ies); |
1321 | rem = ies->len; |
1322 | ie = ies->data; |
1323 | |
1324 | while (rem >= 2) { |
1325 | /* invalid data */ |
1326 | if (ie[1] > rem - 2) |
1327 | break; |
1328 | |
1329 | switch (ie[0]) { |
1330 | case WLAN_EID_SSID: |
1331 | memset(&iwe, 0, sizeof(iwe)); |
1332 | iwe.cmd = SIOCGIWESSID; |
1333 | iwe.u.data.length = ie[1]; |
1334 | iwe.u.data.flags = 1; |
1335 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
1336 | &iwe, (u8 *)ie + 2); |
1337 | break; |
1338 | case WLAN_EID_MESH_ID: |
1339 | memset(&iwe, 0, sizeof(iwe)); |
1340 | iwe.cmd = SIOCGIWESSID; |
1341 | iwe.u.data.length = ie[1]; |
1342 | iwe.u.data.flags = 1; |
1343 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
1344 | &iwe, (u8 *)ie + 2); |
1345 | break; |
1346 | case WLAN_EID_MESH_CONFIG: |
1347 | ismesh = true; |
1348 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
1349 | break; |
1350 | buf = kmalloc(50, GFP_ATOMIC); |
1351 | if (!buf) |
1352 | break; |
1353 | cfg = (u8 *)ie + 2; |
1354 | memset(&iwe, 0, sizeof(iwe)); |
1355 | iwe.cmd = IWEVCUSTOM; |
1356 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1357 | "0x%02X", cfg[0]); |
1358 | iwe.u.data.length = strlen(buf); |
1359 | current_ev = iwe_stream_add_point(info, current_ev, |
1360 | end_buf, |
1361 | &iwe, buf); |
1362 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1363 | cfg[1]); |
1364 | iwe.u.data.length = strlen(buf); |
1365 | current_ev = iwe_stream_add_point(info, current_ev, |
1366 | end_buf, |
1367 | &iwe, buf); |
1368 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1369 | cfg[2]); |
1370 | iwe.u.data.length = strlen(buf); |
1371 | current_ev = iwe_stream_add_point(info, current_ev, |
1372 | end_buf, |
1373 | &iwe, buf); |
1374 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
1375 | iwe.u.data.length = strlen(buf); |
1376 | current_ev = iwe_stream_add_point(info, current_ev, |
1377 | end_buf, |
1378 | &iwe, buf); |
1379 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1380 | iwe.u.data.length = strlen(buf); |
1381 | current_ev = iwe_stream_add_point(info, current_ev, |
1382 | end_buf, |
1383 | &iwe, buf); |
1384 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1385 | iwe.u.data.length = strlen(buf); |
1386 | current_ev = iwe_stream_add_point(info, current_ev, |
1387 | end_buf, |
1388 | &iwe, buf); |
1389 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
1390 | iwe.u.data.length = strlen(buf); |
1391 | current_ev = iwe_stream_add_point(info, current_ev, |
1392 | end_buf, |
1393 | &iwe, buf); |
1394 | kfree(buf); |
1395 | break; |
1396 | case WLAN_EID_SUPP_RATES: |
1397 | case WLAN_EID_EXT_SUPP_RATES: |
1398 | /* display all supported rates in readable format */ |
1399 | p = current_ev + iwe_stream_lcp_len(info); |
1400 | |
1401 | memset(&iwe, 0, sizeof(iwe)); |
1402 | iwe.cmd = SIOCGIWRATE; |
1403 | /* Those two flags are ignored... */ |
1404 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
1405 | |
1406 | for (i = 0; i < ie[1]; i++) { |
1407 | iwe.u.bitrate.value = |
1408 | ((ie[i + 2] & 0x7f) * 500000); |
1409 | p = iwe_stream_add_value(info, current_ev, p, |
1410 | end_buf, &iwe, IW_EV_PARAM_LEN); |
1411 | } |
1412 | current_ev = p; |
1413 | break; |
1414 | } |
1415 | rem -= ie[1] + 2; |
1416 | ie += ie[1] + 2; |
1417 | } |
1418 | |
1419 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1420 | ismesh) { |
1421 | memset(&iwe, 0, sizeof(iwe)); |
1422 | iwe.cmd = SIOCGIWMODE; |
1423 | if (ismesh) |
1424 | iwe.u.mode = IW_MODE_MESH; |
1425 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) |
1426 | iwe.u.mode = IW_MODE_MASTER; |
1427 | else |
1428 | iwe.u.mode = IW_MODE_ADHOC; |
1429 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
1430 | &iwe, IW_EV_UINT_LEN); |
1431 | } |
1432 | |
1433 | buf = kmalloc(31, GFP_ATOMIC); |
1434 | if (buf) { |
1435 | memset(&iwe, 0, sizeof(iwe)); |
1436 | iwe.cmd = IWEVCUSTOM; |
1437 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); |
1438 | iwe.u.data.length = strlen(buf); |
1439 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
1440 | &iwe, buf); |
1441 | memset(&iwe, 0, sizeof(iwe)); |
1442 | iwe.cmd = IWEVCUSTOM; |
1443 | sprintf(buf, " Last beacon: %ums ago", |
1444 | elapsed_jiffies_msecs(bss->ts)); |
1445 | iwe.u.data.length = strlen(buf); |
1446 | current_ev = iwe_stream_add_point(info, current_ev, |
1447 | end_buf, &iwe, buf); |
1448 | kfree(buf); |
1449 | } |
1450 | |
1451 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1452 | rcu_read_unlock(); |
1453 | |
1454 | return current_ev; |
1455 | } |
1456 | |
1457 | |
1458 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, |
1459 | struct iw_request_info *info, |
1460 | char *buf, size_t len) |
1461 | { |
1462 | char *current_ev = buf; |
1463 | char *end_buf = buf + len; |
1464 | struct cfg80211_internal_bss *bss; |
1465 | |
1466 | spin_lock_bh(&dev->bss_lock); |
1467 | cfg80211_bss_expire(dev); |
1468 | |
1469 | list_for_each_entry(bss, &dev->bss_list, list) { |
1470 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
1471 | spin_unlock_bh(&dev->bss_lock); |
1472 | return -E2BIG; |
1473 | } |
1474 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1475 | current_ev, end_buf); |
1476 | } |
1477 | spin_unlock_bh(&dev->bss_lock); |
1478 | return current_ev - buf; |
1479 | } |
1480 | |
1481 | |
1482 | int cfg80211_wext_giwscan(struct net_device *dev, |
1483 | struct iw_request_info *info, |
1484 | struct iw_point *data, char *extra) |
1485 | { |
1486 | struct cfg80211_registered_device *rdev; |
1487 | int res; |
1488 | |
1489 | if (!netif_running(dev)) |
1490 | return -ENETDOWN; |
1491 | |
1492 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
1493 | |
1494 | if (IS_ERR(rdev)) |
1495 | return PTR_ERR(rdev); |
1496 | |
1497 | if (rdev->scan_req) |
1498 | return -EAGAIN; |
1499 | |
1500 | res = ieee80211_scan_results(rdev, info, extra, data->length); |
1501 | data->length = 0; |
1502 | if (res >= 0) { |
1503 | data->length = res; |
1504 | res = 0; |
1505 | } |
1506 | |
1507 | return res; |
1508 | } |
1509 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
1510 | #endif |
1511 |
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